【do it】 —

1. have a required effect:

• Again I did not go and pleaded the same reason. That apparently did it—she stopped asking me to lunch parties.

2. (euph.) have sex:

• At sixteen you’re horny enough to get an erection watching two parakeets 【do it】 , let alone humans.

3. (coll.) make a mess of things; make a foolish blunder:

• Oh God! I’ve done it again. When will I learn to hold my tongue.

4. (euph.) defecate or urinate:

• Look what happened. The dog did it again on the Persian carpet!

Note: The expression does not correlate in meaning with the phrase overdo it—

1. overexert oneself:

• He overdid it last winter and now evidently stands in need of rest.

2. carry smth. to excess; do too much:

• She seemed to be an attractive woman who overdid it with makeup and clothes.

【make it】 —

1. successfully accomplish smth.:

• The charts showed we had made it, and big.

2. recover from an illness, etc.; survive:

• He’s so sick, I don’t think he’ll 【make it】 .

3. get to a particular place, especially in time:

• Although they got out late, they made it.

4. = 【do it】 2:

• Those bedroom eyes were telling him their owner wanted to 【make it】 .