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In some senses, cos is marked as informal, UK. Watch for register when choosing this word.
noun
Synonym of romaine lettuce, a long-leaved variety of lettuce.
conj
Informal spelling of 'cause (“because”).
Taking the shortcut through the alleyway by the Jobcentre Plus, just cos I can, we arrive at my flat within minutes.
noun
Alternative form of coz, cousin.