Examples:

• When she heard the good news, she grinned like a Cheshire cat.
• His face lit up, and he grinned like a Cheshire cat when he saw the surprise party.
• The magician performed a fantastic trick that left the audience grinning like Cheshire cats.
• After winning the race, he couldn't stop grinning like a Cheshire cat.
• Sarah couldn't contain her excitement and grinned like a Cheshire cat throughout the entire movie.
• The children were so delighted with their presents that they all grinned like Cheshire cats.
• His mischievous grin made him look like a Cheshire cat up to something.
• Even in the face of adversity, she managed to grin like a Cheshire cat.
• When he realized he had aced the exam, he couldn't help but grin like a Cheshire cat.
• After receiving a compliment from her crush, she walked away grinning like a Cheshire cat.
• The surprise proposal had her grinning like a Cheshire cat for days.
• The winning team celebrated their victory with grins like Cheshire cats.
• Despite the rain, they enjoyed the outdoor picnic and grinned like Cheshire cats.
• Seeing her old friend after many years, she grinned like a Cheshire cat.
• The comedian's jokes had the entire audience grinning like Cheshire cats.
• The delicious smell of freshly baked cookies made everyone in the house grin like Cheshire cats.
• He couldn't hide his excitement and grinned like a Cheshire cat when he met his favorite celebrity.
• When the teacher announced no homework for the weekend, the students grinned like Cheshire cats.
• The surprising plot twist in the book had readers grinning like Cheshire cats.
• Even though it was a tough challenge, they completed it successfully and grinned like Cheshire cats.