
mountain
( mountains plural )
1 n-count A mountain is a very high area of land with steep sides.
Ben Nevis, in Scotland, is Britain's highest mountain.
2 quant If you talk about a mountainof something, or mountainsof something, you are emphasizing that there is a large amount of it.
INFORMAL QUANT of pl-n/n-uncount (emphasis)
They are faced with a mountain of bureaucracy...
3 If you say that someone has a mountain to climb, you mean that it will be difficult for them to achieve what they want to achieve. (JOURNALISM)
♦
a mountain to climb phrase usu v PHR
`We had a mountain to climb after the second goal went in,' said Crosby.
4 →
to make a mountain out of a molehill →
molehill
mountain bike ( mountain bikes plural ) A mountain bike is a type of bicycle that is suitable for riding over rough ground. It has a strong frame and thick tyres. n-count
mountain lion ( mountain lions plural ) A mountain lion is a wild animal that is a member of the cat family. Mountain lions have brownish-grey fur and live in mountain regions of North and South America.
(mainly AM) n-count
(=cougar)
in BRIT, use puma
Translation English - Cobuild Collins Dictionary  

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"