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don't put all your eggs in the one basket = don't store all your photos on the one phone
look before you leap = google before you leave the flat
the calm before the storm = john's look before he rants.
lets make a long long list :D
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In Sherlock, the friendzone is more like human coffee, or walking case zone.
biting the bullet=entering the resteruant
break the ice=offer to repair Johnlock
eat humble pie=pretend it's doomsday and beg for forgiveness.
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A bad penny always turns up - Moriarty is always waiting...
A good man is hard to find - John Watsons are hard to find!
A word to the wise is enough - 'Vatican Cameos!'