As merry as a grig and In high spirits

In high spirits and as merry as a grig are semantically related. In some cases you can replace phrase "In high spirits" with "As merry as a grig", this phrases are similar.

In high spirits adjective - Happy and excited and energetic.

As merry as a grig and in high spirits are semantically related. Sometimes you can replace phrase "As merry as a grig" with "In high spirits", this phrases are similar. archaic substitute