teach grandma how to suck eggs

eggs in moonshine

A fanciful notion; an unrealistic or ludicrous concept.

kill the goose that lays the golden eggs

To seek short-term gain at the sacrifice of long-term profit.

lay eggs

To produce a string of failures or flops.

price of eggs

Something that is relevant or important, usually used to emphasize that another, compared thing is irrelevant, unimportant, or non sequitur.

put all one's eggs in one basket

To rely on a single source (as of income), rather than diversifying.

suck a big one

To be terrible; to be of a very low standard.

suck a lemon

To be in a sour or negative mood.

suck and blow

To perform two incompatible actions; to hold views which are in contradiction.