tight-lipped

adj keeping the lips pressed firmly together,esp to restrain one's emotion or to keep silent; grim-looking 双唇紧闭的（尤指克制感情或保持沉默）; 表情冷酷的.

tie, tie up, tie-beam, tie-breaker (also `tie-break), tie-dye, tie-dyeing, tie-on, tie-pin (US `stickpin, `tie-tack), tie-up, tied, tier, tiered, tiff, tig, tiger, tiger-lily, tiger-moth, tigerish, tight, tight-fisted, tighten, tightfisted, tightly, tightness, tightrope, tights, tigress, tike, tilde, tile, till, tillage, tiller, tilt, tilted, tilth, timber, timber-line, timber-wolf, timbered,