Asks for permission to enter a room.

Of or pertaining to a hunter-gatherer culture that existed in northeastern Europe from around 4200 BC to around 2000 BC.

A type of boot designed to be worn by soldiers during actual combat or combat training

(idiomatic) To make significant progress.

Bad things or situations always come in groups or streaks, they never come in a single way.

(idiomatic) What you just said reminds me of something; Used to justify a change of subject or a kind of statement that needs some kind of license.

(thermodynamics) using multiple thermodynamic cycles so that the overall effect is greater than the sum of the parts

(idiomatic) To fight; to initiate physical conflict, especially subsequent to escalating tension or antagonism.

Alternative form of internal combustion engine

(rare) Something which is to come. / (rare) The future.