No Big Thing' is an idiom used to describe something that is not important or significant. The four crossword solutions for this term are MITE, TRIFLE, MOTE, and BLIP. MITE is a very small creature or insect, while TRIFLE refers to something trivial or insignificant. MOTE is a tiny particle of dust or dirt, and BLIP is a short burst of sound or light. All four words are used to describe something that is not important or significant, which is the meaning of the idiom 'No Big Thing'.