In an undeniable manner, or to an undeniable extent. / Used as a modal adverb to assert that that the indicated statement is undeniable.

(transitive, intransitive) To charge less than the correct amount. / (transitive, firearms) To put too small a charge into.

A monetary charge that is less than the correct amount.

Not declared

(idiomatic, followed by a clause) Thinking or making assumptions, often incorrectly.

(of a defeated army) To be humiliated by the victors.

below par

(idiomatic) To conceal one's positive qualities or talents, especially due to modesty or shyness; to avoid attention.

(rail transport, slang, Britain) A person under a train; a person hit by a train after jumping or falling in front of it.

(US) The opposite of an upperclassman; a freshman or sophomore.