Anagrams of: UNDERDOSE

• ring or echo with sound

• emit a noise

• be behind; approve of

• give support or one's approval to

• guarantee as meeting a certain standard

• sign as evidence of legal transfer

• break apart or in two, using violence

• return or recoil

• contribute

• have an effect for good or ill

• put up with something or somebody unpleasant

• face and withstand with courage

• continue to live and avoid dying

• undergo or be subjected to

• last and be usable

• persist for a specified period of time

• continue to exist

• curving and somewhat round in shape rather than jagged