つのtsunoru
1.

To gradually intensify to the point where it becomes overwhelming, often referring to emotions or feelings such as anxiety, distrust, or desire.

2.

To increase in degree or extent, often indicating a notable escalation in a situation, such as worsening weather conditions or a rising external pressure.

3.

To gather resources, such as money, personnel, or materials, through a broad appeal for a specific purpose or cause.

Example:

世界の航空産業は墜落事故についての懸念を募らせている。

iiつのtsunoru
1.

To speak with increasing intensity and fervor, often as a result of getting carried away or becoming emotionally charged during a discussion or dispute.

2.

To persistently assert one's opinions in a progressively more forceful manner, sometimes leading to an escalation in tone or volume.

3.

To engage in a vigorous exchange of opinions, particularly when emotions run high, resulting in a notable shift to a more passionate or emphatic style of communication.