Performing as well as one can.

Placed in a situation where one's best behaviour is necessary or advisable.

As far as concerns one.

Synonym of for one's life

Having come to the end of one's resources. / Used other than figuratively or idiomatically: see on, one's, back.

(idiomatic, transitive) To compel someone or something to conform to one's desires.

(Australia) Said of a person who is on their provisional driver's licence and displays P-plates on their vehicle; not yet possessing a full driver's licence.

(Australia) Said of a person who is on their learner's permit and displays L-plates on their vehicle; not yet possessing a provisional or full driver's licence.

Alternative form of on one's L's.

Alternative form of on one's P's.