The phrase "to involve a lawyer" means to seek or use the help of a legal professional to handle a situation or issue that requires legal expertise or advice. Full definition
Here's some information about an American case involving lawyers in a potential E & O case. (remonline.com)
It was, in some cases, a form of «rough justice» that often did not involve lawyers. (slaw.ca)
Practical methods for recovering often involve a lawyer who can remove the burden of police reports, insurance paperwork, and phone calls requesting recorded statements. (pittmandutton.com)