What is the category of a phrase like "I'll take it from here"? [closed]

Solution 1:

The closest term I can think of to describe this kind of construction is cliché:

cliché n
1. (Linguistics) a word or expression that has lost much of its force through overexposure, as for example the phrase: it's got to get worse before it gets better.

There is probably some difference, though, since the examples you cite are so common they may not even rise to the standard of cliché. Nevertheless, they are expressions that have lost their force through overexposure, so they do fit the definition.

In fact, these expressions may have lost so much force they could fall under the aegis of phatic communication

phatic adj
Of or relating to communication used to perform a social function rather than to convey information or ideas.

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