guilt trip

Short definition from Wiktionary

Noun

1. 1
   A feeling of shame or embarrassment, especially if self-indulgent, unwarranted, exaggerated or felt over a significant period of time.
2. 2
   An act that produces such a feeling.

Verb

1. 1
   Alternative form of guilt-trip.
2. 2
   To attempt to induce a guilt trip; to cause another to feel guilt, in order to influence the behavior of that individual.