knee ‧ jerk /ˈniːdʒɜːk $ -dʒɜːrk/ BrE AmE verb [intransitive]
to react to a situation too quickly, usually by saying or doing something without thinking properly about it
knee ‧ jerk /ˈniːdʒɜːk $ -dʒɜːrk/ BrE AmE verb [intransitive]
to react to a situation too quickly, usually by saying or doing something without thinking properly about it
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012