Etymology
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share (n.1)

[portion of something belonging to an individual], Middle English share, from Old English scearu "a cutting, shearing, tonsure; a part or division, a piece cut off," from the source of sceran "to cut," from Proto-Germanic *skeraz (source also of Old High German scara "troop, share of forced labor," German Schar "troop, band," properly "a part of an army," Old Norse skör "rim"), from PIE root *sker- (1) "to cut," and compare share (n.2).

In Old English mostly in compounds: landscearu "a share of land," folcscearu "a division of the people." By late 14c. as "part or definite portion of a thing owned by a number in common" (in reference to booty or war prizes); the specific commercial meaning "part of the capital of a joint stock company" is attested by c. 1600.

The same Old English noun in the sense "division" led to an obsolete noun share "fork ('division') of the body at the groin; pubic region" (late Old English and Middle English); hence share-bone "pubis" (early 15c.).

share (n.2)

"broad iron blade of a plow," Middle English share, from Old English scear, scær "plowshare," properly "that which cuts," from Proto-Germanic *skeraz (source also of Old Saxon sker "razor;" Old Frisian sker, schere, Middle Low German schar, Old High German scar "plowshare," also German Schar, Dutch ploegschaar, Middle High German pfluocschar), from PIE root *sker- (1) "to cut." Compare shear (v.).

share (v.)

1580s, "to apportion to someone as his share; to apportion out to others; to enjoy or suffer (something) with others," from share (n.1). The meaning "to divide one's own and give part to others" is recorded from 1590s; also "have a part, get one's portion;" also, of two or more, "to each take a portion."

The sense of "confess one's sins openly" (1932, implied in sharing) is said in OED to be from the Moral Rearmament movement, in which "the sharing of our sins and temptations with another Christian life given to God" was a principal spiritual activity. Share and share alike is attested from 1560s. Related: Shared; sharing.

updated on August 07, 2022

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Definitions of share from WordNet
1
share (v.)
have in common;
Our children share a love of music
The two countries share a long border
share (v.)
use jointly or in common;
share (v.)
have, give, or receive a share of;
We shared the cake
Synonyms: partake / partake in
share (v.)
give out as one's portion or share;
Synonyms: divvy up / portion out / apportion / deal
share (v.)
communicate;
I'd like to share this idea with you
2
share (n.)
assets belonging to or due to or contributed by an individual person or group;
he wanted his share in cash
Synonyms: portion / part / percentage
share (n.)
any of the equal portions into which the capital stock of a corporation is divided and ownership of which is evidenced by a stock certificate;
he bought 100 shares of IBM at the market price
share (n.)
the allotment of some amount by dividing something;
death gets more than its share of attention from theologians
Synonyms: parcel / portion
share (n.)
the effort contributed by a person in bringing about a result;
they all did their share of the work
Synonyms: contribution / part
share (n.)
a sharp steel wedge that cuts loose the top layer of soil;
Synonyms: plowshare / ploughshare
From wordnet.princeton.edu, not affiliated with etymonline.