The word sink has different meanings. You should sign "sink" in a way that
matches your meaning.
Often "sink" is just spelled out (S-I-N-K) since it is a relatively
short word and it is actually easier (for skilled fingerspellers) to spell
"sink" with one hand than to do a two handed sign depicting a sink.
SINK / fs-SINK / spelled version:
Sample sentence on Youtube: "What color is your sink?"
See: https://youtu.be/Gb-HMMkGYdw
SINK (depictive version)
You can use your hands to show the size and shape of a sink, tub, or basin.
For additional clarity of your concept you may wish to mime turning of two water faucet
handles.
BOWL: basin, tub, rounded container, basket, etc.
SINK (version 2)
Sink as in to become submerged, to descend into liquid, drown:
Notes:
Notes: