The bulk update request #10738 is pending approval.

create alias arm_under_breast (86) -> arm_under_breasts (2518)
create alias arms_crossed_under_breasts (164) -> arm_under_breasts (2518)
create alias hand_under_breast (201) -> arm_under_breasts (2518)
create alias hands_under_breasts (106) -> arm_under_breasts (2518)
create implication arm_under_breasts (2518) -> breasts (1843523)

Reason: Do we need all these tags for what is mostly the same thing? Do we need to differentiate between singular and plural? arms_under_breasts is already aliased to arm_under_breasts but the wiki pages still emphasize a difference between the tags.

hand(s)_under_breast(s) contains a mixture of arm_under_breasts and holding_breast.

Also arm_under_breasts doesn't implicate breasts for some reason.