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1. To break or detach (from something) with minimal force, especially resulting in an audible snap. The wings of the model airplane simply snap off, allowing you to mix and match different styles. Be careful with that vase! I don't want the decorative flower petals to snap off.
2. To break or detach something (from something else), especially with an audible snap. In this usage, a noun or pronoun can be used between "snap" and "off." I snapped a branch off of the tree and began sharpening it with my knife. You'll need to snap off the back panel of the computer to access the CPU.
3. To turn off some electronic device, especially a television or radio. In this usage, a noun or pronoun can be used between "snap" and "off." My mother hates that politician so much that she snaps off the TV whenever he comes on. He got up from his chair, snapped the radio off, and shuffled out of the room.
snap something off
to break off something brittle. Liz snapped a bit of the rock off and put it in her bag. Carl snapped off a piece of the candy and gave it to Timmy.