Every Saturday I’ll give you a couple of idioms to learn. An idiom is a saying or phrase whose meaning cannot be taken from the literal meanings of the words.
number-cruncher: an accountant, someone who works with numbers.
Example:
Although Bob wasn’t hired as a number-cruncher, he ended up becoming head of accounts receivable.
in charge of: in control of, responsible for.
Example:
Let me speak to the person in charge of accounts payable, please.