The difference between Oppose and Take on

When used as verbs, oppose means to attempt to stop the progression of, whereas take on means to acquire, bring in, or introduce.

check bellow for the other definitions of Oppose and Take on

Oppose as a verb:

To attempt to stop the progression of; to resist or antagonize by physical means, or by arguments, etc.; to contend against; to confront; to resist; to withstand.

Examples:

"to oppose the king in battle; to oppose a bill in Congress"

"There is still time to oppose this plan."
Oppose as a verb:

To object to.

Examples:

"Many religious leaders oppose cloning humans."
Oppose as a verb:

To present or set up in opposition; to pose.

Examples:

"They are opposed to any form of hierarchy."
Oppose as a verb:

To place in front of, or over against; to set opposite; to exhibit.

Take on as a verb:

To acquire, bring in, or introduce.

Examples:

"The ship took on cargo in Norfolk yesterday."
Take on as a verb (idiomatic):

To begin to have or exhibit.

Examples:

"In the dark, the teddy bear took on the appearance of a fearsome monster."
Take on as a verb (idiomatic):

To assume responsibility for.

Examples:

"I'll take on the project if no one else will."
Take on as a verb (idiomatic):

To attempt to fight or compete with.

Examples:

"I don't recommend taking on that bully, since he's bigger than you are."
Take on as a verb (intransitive, colloquial):

To catch on, do well; to become popular.
Take on as a verb (intransitive, idiomatic):

To show emotion, to grieve or be concerned about something or someone.
Take on as a verb:

To obtain the services of (a person) in exchange for remuneration; to give someone a job.
Take on as a verb (dated, slang):

To have sex.