have a tiger by the tail

chase one's tail

To busily try to perform many tasks or to repeatedly revise one's plans, especially with inefficient use of one's time and limited results.

chase tail

To be on the hunt for a (usually sexual) partner.

grow a tail

to be nearly about to defecate, to the point of being unable to completely hold it in

have the tiger by the tail

To be in a difficult or dangerous situation in which one ideally should not remain, but from which one cannot withdraw.

have the world by the tail

To possess great influence and opportunity.

kick some tail

To be authoritative and assertive in order to achieve or accomplish something.

lady or tiger

A pure gamble with highly divergent outcomes.

make head or tail of

To understand even minimally.