bicho — meaning in English

English meaning

animal noun A living, moving organism that feeds on other organisms rather than making its own food, as distinct from plants and fungi.
bug noun A small insect, or loosely, any small crawling or flying creature.
freshman noun A student in their first year at a high school, college, or university.
guy noun A man or boy; an informal word for a male person.

bicho is used for these senses in English:

animal (science) Any member of the kingdom Animalia of multicellular organisms that are usually mobile, whose cells are not encased in a rigid cell wall (distinguishing them from plants and fungi) and which derive energy solely from the consumption of other organisms (further distinguishing them from plants).
bug (gambling, slang) A metal clip attached to the underside of a table, etc. to hold hidden cards, as a form of cheating.
freshman (US, Canada, Philippines) a person (of either sex) entering the first year of an institution, especially a high school (ninth grade for US, grade 9 for Canada, grade 7 for Philippines), a university, or legislative body
guy (colloquial) Anything seen to have character and personality, such as an animal or a toy.
guy (informal, term of address) Buster, Mack, fella, bud, man.

noun A living, moving organism that feeds on other organisms rather than making its own food, as distinct from plants and fungi.
noun Any creature other than a human, especially a mammal.
noun Informal: a person who acts in a wild, brutal, or uncontrolled way.
adj Relating to animals, or driven by raw physical instinct rather than reason.