From Longman Dictionary of Contemporary Englishsit tightsit tightspokena)STAY/NOT LEAVEto stay where you are and not moveJust sit tight – I’ll be there in five minutes.b)NOT DO somethingto stay in the same situation, and not change your mind and do anything newWe’re advising all our investors to sit tight till the market improves. →sitExamples from the Corpussit tight• You could head back to the Cities, just sit tight.• She is loath to encouragefolks to sit tight.• Through the summer runup in technologystockprices, executives at the on-line service providersat tight.• You might want to sit tight a few months and see what happens to the stock market.• Then city officialssat tight and hoped it would pay off.• Just sit tight - I'll be there in ten minutes.• He might just sit tightinside the castle.• When an intruderapproaches, the parentsfly off and the chickssit tight nomatterhow close it comes.• Or the rabbitssit tightunderground as they become cornered by the ferrets.• You sit tight while I go and get some help.