The phrase "troubled waters" means a difficult or chaotic situation. It is often used metaphorically to describe a troubled or unsettled state, similar to stormy or rough waters. Full definition
Of course, any healthy relationship should already be founded on these three principles, but it is extremely important to apply them when you are building a bridge over troubled waters. (petesgrillandpizza.com)
Life is a voyage; Love is a boat — In troubled waters it keeps us afloat. (theletteredcottage.net)
Has a rare ability to pour oil on troubled waters. (telegraph.co.uk)