牵涉 (qiānshè) means 'to involve' or 'to implicate' and is used when a person, matter, or case is connected to something, often with a neutral to slightly negative tone. It is similar to 涉及 (shèjí), which is more neutral and often used for topics or scope, and to 牵扯 (qiānchě), which implies a more tangled or negative involvement. 卷入 (juǎnrù) is stronger, meaning 'to be drawn into' a negative situation.