Toss

wiktionary

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From Middle English tossen(“to buffet about, agitate, toss; to sift or winnow”), of uncertain origin. Perhaps from Old Norse (compare dialectal Norwegian tossa, dialectal Swedish tossa(“to strew, spread”)), or perhaps from an alteration of Middle English tosen(“to tease, pull apart, shred; to wound, injure”). Compare also Dutch tassen(“to pile or heap up, stack”).

The Welsh tos(“a quick jerk”) and tosio(“to jerk, toss”) are probably borrowed from the English.

etymonline

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toss (v.)

mid-15c., "to lift or throw with a sudden movement," of uncertain origin, possibly from a Scandinavian source (compare dialectal Norwegian tossa "to strew, spread"). Food preparation sense (with reference to salad, etc.) is recorded from 1723. Intransitive sense "be restless; throw oneself about" is from 1550s. Related: Tossed; tossing.

toss (n.)

"an act of throwing," 1630s, from toss (v.). Meaning "a coin toss" is from 1798.