act like a wet blanket

avert block dampen daunt discourage dissuade forestall frighten hinder impede intimidate obstruct preclude prevent prohibit restrain scare stop

caution chill cool damp debar divert forfend obviate warn

disadvise put a damper on put off rule out shut out stave off talk out of throw cold water on

advance aid allow assist encourage facilitate forward hearten help incite inspirit permit promote push support

heat warm

instigate persuade put on to stimulate turn on urge