Synonyms for Be on best behavior:

• v.

  •act reasonably, properly (verb)
  • behave.
  •behave (verb)
  • deport oneself,
  • conduct oneself properly,
  • mind one's manners,
  • play fair,
  • comport oneself,
  • discipline oneself,
  • mind one's p's and q's,
  • be nice,
  • direct,
  • act correctly,
  • watch one's step,
  • live up to,
  • be civil,
  • keep the peace,
  • toe the mark,
  • manage oneself,
  • observe the law,
  • be good,
  • shape up,
  • keep one's nose clean,
  • observe golden rule,
  • demean oneself,
  • act one's age,
  • be orderly,
  • act with decorum,
  • manage,
  • control.

• Other synonyms:

  •behave
  • watching one's step,
  • mind p's and q's,
  • minding p's and q's.
  •Other relevant words:
  • contain,
  • take aim,
  • control condition,
  • finagle,
  • moderate,
  • calculate,
  • advance,
  • see to it,
  • command,
  • comport,
  • fulfill,
  • get along,
  • mastermind,
  • fulfil,
  • straight,
  • hold in,
  • get on,
  • come along,
  • deal,
  • channelize,
  • dominance,
  • organize,
  • ascendence,
  • get by,
  • manoeuvre,
  • acquit,
  • see,
  • progress,
  • directly,
  • head,
  • carry,
  • lead,
  • channelise,
  • train,
  • target,
  • mastery,
  • check,
  • curb,
  • ascendancy,
  • engineer,
  • verbatim,
  • address,
  • assure,
  • bear,
  • ascendance,
  • pull off,
  • make out,
  • take,
  • come on,
  • act,
  • master,
  • superintend,
  • wangle,
  • operate,
  • maneuver,
  • lineal,
  • ascendency,
  • carry off,
  • negociate,
  • point,
  • care,
  • insure,
  • manoeuver,
  • restrict,
  • ascertain,
  • send,
  • hold,
  • grapple,
  • steer,
  • orchestrate,
  • restraint,
  • place,
  • guide,
  • verify,
  • make do,
  • bring off,
  • keep in line,
  • conduct,
  • cope,
  • organise,
  • ensure,
  • contend,
  • deport,
  • unmediated,
  • aim,
  • oversee,
  • supervise,
  • wield,
  • handle,
  • manipulate,
  • controller,
  • satisfy.

Antonyms for Be on best behavior:

• v.

  • behave
    act up, misbehave.