Go ahead

Давай, валяй
If you're both deep and smart enough, go ahead and purchase the DVD, because if you rent it, you will keep wanting to see it over and over again.

if I were you…

На твоём месте я бы…
I'd buy yourself a gun if I were you.

you had better…

тебе следует
In Sicily, when you attack a man, you had better finish him.

Had rather

следует лучше
One had rather, on such occasions, do too much than too little.

what's the use of

в чём прок от
I mean what's the use of being in paradise if you can't have whatever you want.

at full blast / at full power

в полную силу, на полную мощность
Gasping for breath, almost crying, she turns on the shower at full blast and climbs into the tub.

be in touch / keep in touch / get in touch

контактировать / поддерживать контакт / заводить контакт
That ship has weapons powerful enough to penatrate our shields at full power.

When it comes to

когда дойдёт до
When it comes to women, you're a true democrat.

it's all over with…

С… покончено
It's all over with him, Roddy -- he doesn't stir.

feel one's way

осторожно действовать, прощупывать почву
Frodo was feeling his way in the dark, following the sound ,of Gollum's scampering.

Be careful not to

быть осторожным, чтобы не…
Be careful not to scratch that thing, huh?

Get together

соединить
It must have taken him a long time to get them together.

get the better of / get the best of

взять верх
Don't let your imagination get the better of you, Lieutenant.

Near at hand

под рукой
Near at hand is a bottle. He fills his glass and drinks it quickly.

Do away with something

ликвидировать, положить конец
he Thin Man cocks his gun as he heads to the tower to do away with Bosley.

Put an end to

положить чему-либо конец
We can put an end to disease, double the human lifespan, provide the means to cross entire continents in a single step

Do a job on something

наворочить, превратить чёрт знает во что
Jesus, he really did a job on Janiro.

do one's best

прилагать напряжённые усилия
I swear to God I won't try to escape and I'll do my best to get you into Mexico.

do with / do without

обходиться чем-то / обходиться без чего-то
Horses can do with some grain and a little rest. / Amazing how you can do without the essentials of life -- so long as you have the luxuries.

have / get a grip on

иметь / получить контроль над чем-то
Water streams over her, into her eyes, blinding her and making it impossible to get a grip on the creature's body.

get a move on / get rolling / get going / get cracking

начинать, приступать
Better get a move on, you're gonna be late for school./ Let's get rolling / So, I guess I better get going./