"movable or removable cover for a pot, etc.," mid-13c., from Old English hlid "covering, opening, gate," from Proto-Germanic *hlidan "a cover," literally "that which bends over" (source also of Old Norse hlið "gate, gap," Swedish lid "gate," Old French hlid, Middle Dutch lit, Dutch lid, Old High German hlit "lid, cover"), from PIE *klito-, from root *klei- "to lean."
Meaning "eyelid" is from early 13c. Slang sense of "hat, cap" is attested from 1896. As a measure of marijuana, one ounce, 1967, presumably the amount of dried weed that would fit in some commercial jar lid. Slang phrase put a lid on "clamp down on, silence, end" is from 1906; many figurative senses are from the image of a pot boiling over.
"having a lid" (of a specified kind), Old English gehlidod, a past-participle form, but no verb *hlidan is attested. See lid (n.).
Proto-Indo-European root meaning "to lean."
It forms all or part of: acclivity; anticline; clemency; client; climate; climax; cline; clinic; clinical; clino-; clitellum; clitoris; decline; declivity; enclitic; heteroclite; incline; ladder; lean (v.); lid; low (n.2) "small hill, eminence;" matroclinous; patroclinous; polyclinic; proclitic; proclivity; recline; synclinal; thermocline.
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit srayati "leans," sritah "leaning;" Old Persian cay "to lean;" Lithuanian šlyti "to slope," šlieti "to lean;" Latin clinare "to lean, bend," clivus "declivity," inclinare "cause to bend," declinare "bend down, turn aside;" Greek klinein "to cause to slope, slant, incline;" Old Irish cloin "crooked, wrong;" Middle Irish cle, Welsh cledd "left," literally "slanting").
"joint, limb of the body" (now obsolete or provincial), Old English liþ "limb, member, joint," cognate with Old Frisian lith, Dutch lid, Old High German lid, Old Norse liðr, Gothic liþus, and, compounded with ga-, German glied "limb, member." Lith and limb was a Middle English alliterative pairing.
1810, in paper-making, "rectangular frame on which the pulp is placed," from German deckel "lid, little cover," diminutive of decke "cover," from Old High German decchen "to cover," from Proto-Germanic *thakjan, from PIE root *(s)teg- "to cover." Meaning "rough or raw edge of paper" is by 1858.