| stiff-upper-lippery | | | |
| stink a buzzard off a gut wagon | | | |
| stink a dog off a gut wagon | | | |
| stink a skunk off a gut wagon | | | |
| stink eye | | | |
| stink on ice | | | |
| stink the joint out | | | |
| stir shit | | | |
| stir someone's blood | | | |
| stir the embers | | | |
| stock phrase | | | |
| stock-still | | | |
| stone cold | | | |
| stone dead | | | |
| stone deaf | | | |
| stone's throw | | | |
| stonewall | | | |
| stop a bullet | | | |
| stop and smell the roses | | | |
| stop at nothing | | | |
| stop cold | | | |
| stop dead | | | |
| stop press | | | |
| stop someone in their tracks | | | |
| stop the bleeding | | | |
| stop the lights | | | |
| stop the presses | | | |
| store away | | | |
| storm off | | | |
| storm out of the blocks | | | |
| storm-racked | | | |
| stormy weather | | | |
| story | | | |
| storybook | | | |
| story, bud | | | |
| stovepipe | | | |
| stovepipe hat | | | |
| straight and narrow | | | |
| straight away | | | |
| straighten out | | | |
| straighten up | | | |
| straighten up and fly right | | | |
| straight face | | | |
| straight-face test | | | |
| straight from the horse's mouth | | | |
| straight from the shoulder | | | |
| straight goods | | | |
| straight man | | | |
| straight out of the chute | | | |
| straight shooter | | | |
| straight-shooting | | | |
| strain a point | | | |
| strain at a gnat | | | |
| strain at the leash | | | |
| strain every nerve | | | |
| strange bedfellows | | | |
| strange bird | | | |
| strangle the parrot | | | |
| strap on a pair | | | |
| straw-clutching | | | |
| straw-clutchingly | | | |
| straw poll | | | |
| straw that stirs the drink | | | |
| street appeal | | | |
| streets ahead | | | |
| streets behind | | | |
| stretch one's legs | | | |
| stretch the truth | | | |
| strike a blow | | | |
| strike a chord | | | |
| strike a false note | | | |
| strike a light | | | |
| strike it lucky | | | |
| strike it rich | | | |
| strike oil | | | |
| strike one's flag | | | |
| strike someone when they are down | | | |
| strike tallies | | | |
| strike the tent | | | |
| strike up | | | |
| strike while the iron is hot | | | |
| string along | | | |
| string attached | | | |
| string out | | | |
| string to one's bow | | | |
| string up | | | |
| strip off | | | |
| stroke of business | | | |
| stroke of luck | | | |
| stroke of work | | | |
| strong suit | | | |
| strung out | | | |
| strut one's stuff | | | |
| stub out | | | |
| stuck in the mud | | | |
| stuck in the Stone Age | | | |
| stuck on | | | |
| stuck up | | | |
| student union politics | | | |
| stud muffin | | | |