c. 1300, "in love; inclined to love; sexually attracted," from Old French amoros "loving, in love; lovely" (13c., Modern French amoureux), from Late Latin amorosum, from Latin amor "love, affection, strong friendly feeling; one's beloved," from amare "to love, be in love with; find pleasure in" (see Amy). Related: Amorously; amorousness.

"desiring or having consensual intimate relations with more than one partner," by 1972, from poly- + amorous. Related: Polyamory.

"amorous play with the feet" [OED], 1944, from foot (n.). Footie in the same sense is from 1935.

"a significant glance, amorous or malign or both," 1590s, from leer (v.).

"amorous, meant for kissing," 1947, from smooch (n.) + -y (2).

"an oogling stare, an amorous gaze," 1590s, from French oeillide (15c.), from oeil "eye" (from Latin oculus, from PIE root *okw- "to see") + -ade.

"to view with amorous glances or with a design to attract notice," 1680s, a cant word, probably from Low German oeglen, frequentative of oegen "look at," from oege "eye," from Proto-Germanic *augon-, from PIE root *okw- "to see." Related to Dutch ogen "to look at," from oog "eye." Related: Ogled; ogling. The noun meaning "an amorous glance" is attested from 1711; earlier it meant "an eye" (1700).

1873, "fondling, indulgence," verbal noun from pet (v.). Meaning "amorous caressing, foreplay" is from 1920 (in F. Scott Fitzgerald).

early 15c., "nut-like," from nut (n.) + -y (2); from 1660s as "abounding in nuts." Sense of "having the flavor of nuts" is by 1828. Slang meaning "crazy" is by 1898 (see nuts); earlier colloquial sense was "amorous, in love (with)," 1821. [Byron, in a slangy passage in "Don Juan" (1823) uses it of a beggar's doxy; a footnote defines it as "conjointly, amorous and fascinating."] Related: Nuttiness.

also love-sick, "languishing with amorous desire," 1520s, from love (n.) + sick (adj.). Related: Lovesickness.