Wiktionary(0.00 / 0 votes)Rate this definition: 1  climb(Noun) An act of climbing. 2  climb(Noun) The act of getting to somewhere more elevated. 3  climb(Noun) An upwards struggle. 4  climb(Verb) To ascend; rise; to go up. 5  climb(Verb) To mount; to move upwards on. 6  climb(Verb) To scale; to get to the top of something.