Morphology question

[rockinjem 0]

The sign for "decide" (demonstrated in my video) is the morphology of two compound signs.  Can someone tell me what the 2nd compound is?  I know the first is THINK, so it is THINK^_____.  Please help me fill in the blank.

Thanksrockinjem morphology question.mp4

[Jess1403 1]

The second part almost is closely related to the sign explain/describe. But I'm not sure completely. The sign for explain/describe has more movement associated with it but the work decide doesn't necessarily relate to describing something. 

I am sure I didn't answer question but maybe it can lead to someone rememberijng something from class or videos for the sign : decide.

Sorry I couldn't be more help.