Idiomsa drop in the oceanIf an amount is a drop in the ocean, it's a very small portion of the amount that's needed.a ray of sunshineSomething is a ray of sunshine if it brings happiness to someone.a voice (crying) in the wildernessYou're a voice in the wilderness, or a voice crying in the wilderness, if you're expressing an unpopular opinion or insight.answer the call of natureIf you answer the call of nature, you go to the toilet.at sea | all at seaIf you're at sea, or all at sea, you're confused about something and not sure what to do.beat around the bush | beat about the bushIf you beat around the bush, or beat about the bush, you don't say something directly, usually because you don't want to upset the person you're talking to.can't see the forest for the treesIf you can't see the forest for the trees, you can't see the whole situation clearly because you're looking too closely at small details, or because you're too closely involved.can't see the wood for the treesIf you can't see the wood for the trees, you can't see the whole situation clearly because you're looking too closely at small details, or because you're too closely involved.down to earthIf someone is down to earth, they are practical and sensible.go with the flowIf you go with the flow, you relax and go along with whatever is happening.in deep waterIf you're in deep water, you're in some sort of trouble or in a difficult situation.make a mountain out of a molehillIf you make a mountain out of a molehill, you make a small problem seem to be a much bigger problem.make hay while the sun shinesIf you make hay while the sun shines, you make good use of the chance to do something while it lasts.neck of the woodsInformalA neck of the woods is a neighbourhood or a district, usually rural.reach for the moon | reach for the starsIf you reach for the moon, or reach for the stars, you are aiming to achieve something great, or do something very challenging.the tip of the icebergYou can say something is the tip of the iceberg when it's just a small part of something much bigger.under a cloudIf someone is under a cloud, they are suspected of having done something wrong.under the weatherIf you are under the weather, you're not feeling well.virgin territoryYou can say something is virgin territory if it's never been explored before or never been done before.weather a stormIf you weather a storm, you survive a dangerous event or deal with a difficult situation.