Hang on a sec', can I get your help quickly? Just hold this for a moment ... thanks, now take a quick look.
These are really common English phrases, and it's quite useful (nay, very useful) to be able to say it in Mandarin. Fortunately, in true WordPack style, there is a very familiar pattern that links these, and other similar phrases.
The pattern is: 一下
yí xià: Literally this means "one down", but the dictionary translations look more like: one time / once / in a while / all of a sudden / give it a go (when used after a verb).
Here are some of the more common phrases that you'll hear, and certainly ones that you're very likely to use. If you're a little beyond beginner, then you probably already know most of the opening hanzi, in which case the phrases will be really easy to remember.
看一下: kàn yíxià: take a quick look
等一下: děng yíxià: wait a moment
让一下: ràng yíxià: literally this is "yield a moment", but it's used in the context of, for example, "Excuse me, can I get past you?"
拿一下: ná yíxià: hold this for a second
挑一下: tiāo yíxià: usually it's like "let me take my time to choose" (literally: choose a moment)
Now that you've got these phrases sorted, take a moment ...