Nipples may tighten.Logical formLearned from23 sentences. A body may be tightened.Logical formLearned from23 sentences. Hands may tighten on hips.Logical formLearned from23 sentences. Lungs may tighten.Logical formLearned from23 sentences. (Credit standards) may tighten.Logical formLearned from23 sentences. A government may tighten a belt.Logical formLearned from23 sentences. Hands may tighten on shoulders.Logical formLearned from23 sentences. A country may tighten economic sanctions on leaders of a regime.Logical formLearned from23 sentences. Security may be tightened at embassies.Logical formLearned from23 sentences. A race may tighten to a dead heat.Logical formLearned from23 sentences. A country may tighten security on a border.Logical formLearned from23 sentences. A world-city may tighten a grip.Logical formLearned from23 sentences. A president may tighten a grip.Logical formLearned from23 sentences. A male may tighten lips.Logical formLearned from22 sentences. A male may tighten hands.Logical formLearned from22 sentences.