by God! (spoken, old-fashioned)

used to emphasize a feeling of determination or surprise (Some people find this use offensive)

God | God almighty | God in heaven | good God | my God | oh God (spoken)

used to emphasize what you are saying when you are surprised, shocked or annoyed
God, what a stupid thing to do!

God willing (spoken)

used to say that you hope that things will happen as you have planned and that there will be no problems
I'll be back next week, God willing

God / Heaven forbid (that...) (spoken)

used to say that you hope that sth will not happen
Maybe you"ll end up as a lawyer, like me. God forbid!

play God

to behave as if you control events or other people's lives
It is unfair to ask doctors to play God and end someone's life

to God / goodness / Heaven

used after a verb to emphasize a particular hope, wish, etc
I wish to God you'd learn to pay attention!

ye gods! (spoken)

used to show surprise, lack of belief, etc.

(the gods) [pl.] (BrE, informal)

the seats that are high up at the back of a theatre

[sing.] godsend (for sb/sth) | godsend (to sb/sth)

something good that happens unexpectedly and helps sb/sth when they need help
This new benefit has come as a godsend for low-income families

act of God

an event caused by natural forces beyond human control, such as a storm, a flood or an earthquake

be in the lap of the gods

if the result of a situation is in the lap of the gods, you cannot control what will happen

God rest his / her soul | God rest him / her (spoken, old-fashioned)

used to show respect when you are talking about sb who is dead

God's gift (to sb/sth)

a person who thinks that they are particularly good at sth or who thinks that sb will find them particularly attractive
He seems to think he's God's gift to women

for Christ's, God's, goodness', heaven's, pity's, etc. sake

used to emphasize that it is important to do sth or when you are annoyed about sth
Do be careful, for goodness' sake. * Oh, for heaven's sake! * For pity's sake, help me!

thank God / goodness / heaven(s) (for sth)

used to say that you are pleased about sth
Thank God you're safe! * 'Thank goodness for that!' she said with a sigh of relief. * Thanks heavens I've found my keys