guess noun

ADJ. fair, good, reasonable, safe April is the best guess for first deliveries. | calculated, educated, informed, inspired, intelligent As a vet, he could make an educated guess as to what was wrong with his stomach. | rough, wild At a rough guess, I'd say we're about twenty miles from home. | lucky ‘How did you know?’‘It was just a lucky guess.’

VERB + GUESS have, hazard, make, take If you don't know the answer, have a guess. If I might hazard a guess … | give sb ‘Where's Tom?’ ‘I'll give you three guesses!’ (= the answer is fairly obvious and you should guess it easily)

PREP. at a ~ At a guess, I'd say there's a problem with the fuel pump. | ~ about/as to/at He made a wild guess as to how much the piano might cost.