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adjective [before noun ] B2 • synonyms: mandatory, obligatory, required • compulsory education/service/attendance; make something compulsory; compulsory by law/policy; compulsory subject/test/insurance
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required by law or rule; something that must be done, followed, or obeyed and is not optional
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adjective B2 • synonyms: expensive, damaging, dear • costly mistake/error/failure/decision; costly repairs/battle/project; prove/become costly; too costly to do something; costly in terms of something • freq in AmE: 7/10
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causing a lot of harm, damage, or loss, especially in terms of money, time, or other valuable resources
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adjective B2 • synonyms: packed, stuffed, overloaded • patterns: be crammed with something; have something crammed into something • collocations: crammed with boxes/facts/people/tasks • freq in AmE: 6/10
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completely full of people, things, or information — often to the point of being overcrowded, chaotic, or difficult to manage
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