Select the most appropriate meaning of the underlined idiom in the given sentence.

Their relationship has run into rough weather ever since they fell in love with the same girl.

experienced difficulties

The most appropriate meaning of the underlined idiom in the given sentence is experienced difficulties. The idiom "run into rough weather" means to experience problems or difficulties.

The other options are not as appropriate.

• Become pleasant and cordial means to become friendly and agreeable.
• Brought cool breeze and rains means to bring relief from heat or dryness.
• Become stronger and firmer means to become more robust and resilient.