to do as best one can given the circumstances

to make a real contribution, to do something useful, to do useful work

(informal) to use the … technique, to use the old … trick

(vulgar, offensive) to go fuck oneself

to delight someone, to make someone happy, to bring happiness to someone

to do good, to do right

(idiomatic) to win one's spurs, to earn one's stripes

(intransitive) (transitive with avec or entre) to put two and two together, to make the connection / (intransitive) (transitive with avec or entre) to liaise

(transitive with sur) to clear up, to clarify, to shed light on

to have the effect of, to come as / to give to someone the impression of being, to appear to someone to be, to strike someone as