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ASSUME, ASSUMPTION in sign language
Meaning: To suppose to be the case, without proof; to presume or surmise.
Learner tip: Avoid confusing these homophones (or "homosigns) with "assume": GUESS, MISS (variation as in missing a bus).
Vocabulary
Related signs: SUPPOSE.
The difference between "assume" and "presume" is that the former is used when you suppose without any evidence, while the latter is usually used when you suppose based on probability.
Funny Anecdotes
This Deafumption article describes a few anecdotes about how one assumes that a person is deaf.
Written ASL
[Note: ASL writing is not an official standard. This sign language writing remains in a state of open space to allow room for experiment, evolution, and improvement.]

Same digit for MISS (as in 'fail to') and GUESS.
ASL digit written and contributed by Todd Hicks in the ASLwrite community, 2017.