Safe and sound

If you arrive safe and sound, then nothing has harmed you on your way.

Safe as houses

Something that is as safe as houses is very secure or certain.

Safe bet

A proposition that is a safe bet doesn't have any risks attached.

Safe pair of hands

A person who can be trusted to do something without causing any trouble is a safe pair of hands.

Safety in numbers

If a lot of people do something risky at the same time, the risk is reduced because there is safety in numbers.

Saigon moment

(USA) A Saigon moment is when people realise that something has gone wrong and that they will lose or fail.

Sail close to the wind

If you sail close to the wind, you take risks to do something, going close to the limit of what is allowed or acceptable.

Sail under false colours

Someone who sails under false colours (colors) is hypocritical or pretends to be something they aren't in order to deceive people.

Salad days

Your salad days are an especially happy period of your life.

Salt in a wound

If you rub salt in a wound, you make someone feel bad about something that is already a painful experience. 'Pour salt on a wound' is an alternative form of the idiom.

Salt of the earth

People who are salt of the earth are decent, dependable and unpretentious.

Salty dog

A salty dog is an experienced sailor.

Same old, same old

When nothing changes, it's the same old, same old.

Save face

If someone saves face, they manage to protect their reputation.

Save someone's bacon

If something saves your bacon, it saves your life or rescues you from a desperate situation. People can also save your bacon.

Save your skin

If someone saves their skin, they manage to avoid getting into serious trouble.

Saved by the bell

If you are saved by the bell, you are rescued from a danger or a tricky situation just in time.

Saving grace

If someone has some character defects, but has a characteristic that compensate for their failings and shortcomings, this is their saving grace.

Say uncle

(USA) If you say uncle, you admit defeat. ('Cry uncle' is an alternative form.)

Say when

People say this when pouring a drink as a way of telling you to tell them when there's enough in your glass.