To refrain from familiarity with somebody or something; to stay aloof.

(idiomatic, slang) To be authentic, true to oneself.

(religion, dated) To attend the requisite number of church services.

(idiomatic, slang, chiefly imperative) To stay calm; to not get flustered or angry.

Third-person singular simple present indicative form of keep a tight rein on

To exercise strict control over; keep in check.

Used other than figuratively or idiomatically: see keep, honest.

(idiomatic) To be able to proceed with a plan or project, often in the face of difficult circumstances.

Simplicity should be a key aspect in design; don't overcomplicate something.

Third-person singular simple present indicative form of keep the ball rolling