Amerce

v. t.	1.	To punish by a pecuniary penalty, the amount of which is not fixed by law, but left to the discretion of the court; as, the court amerced the criminal in the sum of one hundred dollars. [imp. & p. p. Amerced (å*mẽrst"); p. pr. & vb. n. Amercing.]
	2.	To punish, in general; to mulct. Millions of spirits for his fault amerced Of Heaven. - Milton. Shall by him be amerced with penance due. - Spenser.

Verb	1.	amerce - punish with an arbitrary penalty
	2.	amerce - punish by a fine imposed arbitrarily by the discretion of the court

penalise, penalize, punish