slacken：使松驰，使松散，放慢，减缓，萧条

slack,松懈的，-en,使。引申诸相关词义。

• appellation
• append
• appendix
• appertain
• appetite
• applaud
• applause
• applausive
• apple
• appliance
• applicable
• applicant
• application
• applied
• applique
• apply
• appoint
• appointment
• apportion
• apposite
• apposition
• appraise
• appreciable
• appreciate
• appreciation