The crossword solutions for the term APPEAR UNEXPECTEDLY, WITH 'UP' are CROP and POP. The term APPEAR UNEXPECTEDLY, WITH 'UP' is a phrase that describes something or someone suddenly showing up without warning. The two words CROP and POP are both verbs that can be used to describe this action. CROP is a verb that means to appear suddenly or unexpectedly, while POP is a verb that means to appear suddenly or unexpectedly with a loud sound.