Question

totter means to: move from one country to another and settle there meet or cross at a point; overlap move without being stable, as if threatening to fall go back to a previous state or condition

Explanation:

The word "totter" means to move unsteadily, as if about to fall. This matches the description "move without being stable, as if threatening to fall".

Answer:

C. move without being stable, as if threatening to fall