Just suggesting. I think it would be more practical if there is a collocation 4 in 1 or more (Oxford, Macmillan, Longman and Wordsmyth (2018).
It could be made in tabs or like dictionary of idioms, phrasal verbs, and slangs N in 1.
For wordsmyth, it might be a bit tricky since the collocation is not a separate entity.
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