Skip to main content
foster brother

foster brother

4 3.6
A boy or man who your parents raise in your family though not born to them
  • noun
  • /ˈfɔstər ˈbrʌðər/
translation icon : hermano de crianza
  • Twenty years later, my foster brother was convicted of a felony and sentenced to the Minnesota State Reformatory at Saint Cloud.

I've got a, it's actually my wife's foster brother.

Examples

  • 'Now my foster brother...'

  • In the next scene, I was in the garden with my mother and father, who told me—and this is where there were some actual stepping stones—and my foster brother to go and argue it out. Each time we told the truth or made a point, we could take a step forward.

    Blog text (31)
  • I was the same age as my foster brother; his sister was a year younger.

    Fiction book (1990)
  • My foster brother waited for his punishment; he did not resist; that much should have been familiar.

    Fiction book (1990)
  • In response to this threat, Uthman appointed his foster brother governor of all Egypt, further deepening the dispute between the two men.

  • In response to this threat, Uthman appointed his foster brother governor of all Egypt, further deepening the dispute between the two men.

  • Adrian, my foster brother.

    Blog text (31)
  • When he dies, he leaves her and all his possessions to Porolfr, his foster brother. Porolfr is in Sigrior's father's generation, but marries her anyway.

    Academic text (1997)
  • Growing up, I spent a lot of time playing video games with my foster brother.

  • Whenever I had a problem, I could always count on my foster brother to help me out.

Synonyms

foster-brother
vsfoster brother
1 4.3

A boy or man who is not a blood relative but is raised as part of your family

is written without a hyphen while keeping identical family meaning

How Related

brother
1.0
foster brother
4 3.6
friend
1.0
acquaintance
114 3.5
stranger
1.0

Surface Forms

Morphology

foster + brother

The meaning is directly compositional: 'foster' specifies a non-biological caregiving relation and 'brother' names a male sibling, so their combination clearly denotes a male raised as a sibling by the family but not biologically/adopted. This follows a common adjective + noun pattern found across languages, so a B1 learner who knows both constituents can reliably infer the MWE meaning.

Etymology

Foster brother comes from foster meaning 'to care for' and brother meaning 'a male sibling'. The image is of a boy taken into a home and raised like a real brother, so the phrase means 'a boy who is raised as a member of your family'.